docs: def query_from_file(self, filename, data=None, union=True, limit=None):
          """
          Query your database from a file.
  
          Parameters
          ----------
          filename: str
              A SQL script
          data: list, dict
              Optional argument for handlebars-queries. Data will be passed to the
              template and rendered using handlebars.
          union: bool
              Whether or not "UNION ALL" handlebars templates. This will return
              any handlebars queries as a single data frame.
          limit: int
              Number of records to return
  
          Examples
          --------
          >>> from db import DemoDB
          >>> db = DemoDB()
          >>> q = '''
          ... SELECT
          ...   a.Title,
          ...   t.Name,
          ...   t.UnitPrice
          ... FROM
          ...   Album a
          ... INNER JOIN
          ...   Track t
          ...     on a.AlbumId = t.AlbumId;
          ... '''
          >>> with open("db/tests/myscript.sql", "w") as f:
          ...    f.write(q)
          109
          >>> len(db.query_from_file("db/tests/myscript.sql", limit=10))
          10
  
  
          db.query_from_file("db/tests/myscript.sql", limit=10)
                                             Title  \
          0  For Those About To Rock We Salute You
          1                      Balls to the Wall
          2                      Restless and Wild
          3                      Restless and Wild
          4                      Restless and Wild
          5  For Those About To Rock We Salute You
          6  For Those About To Rock We Salute You
          7  For Those About To Rock We Salute You
          8  For Those About To Rock We Salute You
          9  For Those About To Rock We Salute You
  
                                                Name  UnitPrice
          0  For Those About To Rock (We Salute You)       0.99
          1                        Balls to the Wall       0.99
          2                          Fast As a Shark       0.99
          3                        Restless and Wild       0.99
          4                     Princess of the Dawn       0.99
          5                    Put The Finger On You       0.99
          6                          Let's Get It Up       0.99
          7                         Inject The Venom       0.99
          8                               Snowballed       0.99
          9                               Evil Walks       0.99
          """
          with open(filename) as fp:
              q = fp.read()
  
          return self.query(q, data=data, union=union, limit=limit)